This accounts for why some dialogs may display fewer Active Directory accounts than other dialogs. I.e. Some dialogs may have a different display setting that hides deleted Active Directory users.

E.g. In AD Ediscovery, if you highlight a project on the Home screen, select the "Data Sources" tab, and then click the "Associate" button (green chain icon) and see fewer account names than as are appearing at the Jobs custodians dialog, then this could mean that one or more display settings are set to hide the deleted accounts.